ASoC: renesas: fsi: Add SPU clock support

FSI register accesses on the r8a7740 require the SPU bus clock to be
enabled. Add support for acquiring and managing the SPU clock via the
device tree to ensure proper register access.

Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
Link: https://patch.msgid.link/20260609113836.45079-10-phucduc.bui@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index 43bc77ebcca39df595498ad5d488eaaa64c67d00..716ecf0401fe33c0df221d4b2800b565e222c5c2 100644 (file)
--- a/sound/soc/renesas/fsi.c
+++ b/sound/soc/renesas/fsi.c
@@ -292,6 +292,7 @@ struct fsi_master {
        void __iomem *base;
        struct fsi_priv fsia;
        struct fsi_priv fsib;
+       struct clk *clk_spu;
        const struct fsi_core *core;
        spinlock_t lock;
 };
@@ -983,6 +984,7 @@ static int fsi_clk_set_rate_cpg(struct device *dev,
 static int fsi_clk_init(struct device *dev, struct fsi_priv *fsi)
 {
        struct fsi_clk *clock = &fsi->clock;
+       struct fsi_master *master = fsi->master;
        int is_porta = fsi_is_port_a(fsi);
        int xck, ick, div;
 
@@ -1004,6 +1006,13 @@ static int fsi_clk_init(struct device *dev, struct fsi_priv *fsi)
        if (IS_ERR(clock->own))
                return dev_err_probe(dev, PTR_ERR(clock->own), "Can't get fck clock\n");
 
+       if (!master->clk_spu) {
+               master->clk_spu = devm_clk_get_optional(dev, "spu");
+               if (IS_ERR(master->clk_spu))
+                       return dev_err_probe(dev, PTR_ERR(master->clk_spu),
+                                       "Can't get spu clock\n");
+       }
+
        /* external clock */
        if (xck) {
                clock->xck = devm_clk_get_optional(dev, is_porta ? "xcka" : "xckb");